<template>
   	<div class="container" v-title data-title='写跟进'>
		<textarea class="followTextarea" placeholder="请填写跟进内容,200长度限制" v-model="remark"></textarea>

        <div class="unified-template" style="margin-top: 10px;padding: 10px;">
            <div class="titlePhoto">
                <div style="font-weight: 400;font-size:16px;">上传图片</div>
                <div style="font-size:12px;color:#ccc;">最多上传5张</div>
            </div>
            <ul class="photo-list">
                <li v-for="(row, index) in fileList">
                    <img v-bind:src="row.file" @click="previewImage(index)">
                    <i class="fa fa-times-circle" @click="deletefile(index)"></i>
                </li>
                <li class="departureBtn">
                    <a href="javascript:;">
                        <i class="fa fa-plus"></i>
                    </a>
                    <input type="file" class="fileBtn" @change="upload" name="files" id="files">
                </li>
            </ul>
            <div class="clearfix"></div>
        </div>
        <div class="sendmsg-div">
            <input type="checkbox" name="sendFollowMsg" id="sendFollowMsg" v-model="sendFollowMsg">
            <font>同步发送跟进消息提醒至审核人员</font>
        </div>

		<div class="operation-btn">
			<button class="btn btn-line btn-primary" @click="btnSubmit">提交</button>
			<button class="btn btn-line btn-cancel" @click="btnCancel">取消</button>
		</div>
    </div>
</template>
<script>
    import Exif from 'exif-js'
    export default{
		data(){
			return {
				remark: '',
				btnShow: true,
                imageList:[],
                fileList:[],
                sendFollowMsg: true
            }
		},
		components: {
		},mounted:function(){
            
		},
		methods:{
			btnCancel(){
				var id=this.$route.params.id;
				this.$router.push({name: 'declareDetail',params:{id:id}})
			},
			btnSubmit(){
				var _self = this;
				var flag = true;
				if(!_self.remark){
					flag = false;
					layer.msg("请填写跟进内容",{
						time: 2000
					});
				}
				if(_self.remark.length > 200){
					flag = false;
					layer.msg("跟进内容不能超过200字符",{
						time: 2000
					});
                }
				if(flag){
                    if(!_self.btnShow) {
                        layer.msg("请勿重复提交",{
                            time: 2000
                        });
                        return;
                    }
					_self.btnShow = false;
					var params = {};
                    params.remark = _self.remark;
                    params.affixList = _self.imageList;
                    params.sendFollowMsg = _self.sendFollowMsg;
					//客户报备记录Id
					var id = this.$route.params.id;
					params.customerPremisesId = id;
					var body = {};
					body.params = params;
					var url = this.utilHelper.apiUrl+'/api/addFollow';
					this.$http.post(url,body).then((response)=>{
						var body = response.body;
						if(body.result == 1){
							layer.msg("操作成功",{
								time: 2000
							}, function(){
								_self.$router.push({name: 'declareDetail',params:{id:id}})
							});
						}else{
							_self.btnShow = true;
							layer.msg("跟进失败,退出本页重新跟进", {
								time: 2000
							});
						}
					});
				}
			},

            //////////////////////////图片上传//////////////////////////
            upload (e) {
                let files = e.target.files || e.dataTransfer.files;
                if (!files.length) return;
                this.picValue = files[0];
                this.imgPreview(this.picValue);
            },
            imgPreview (file) {
                let self = this;
                let Orientation;
                //去获取拍照时的信息，解决拍出来的照片旋转问题  
                Exif.getData(file, function(){
                    Orientation = Exif.getTag(this, 'Orientation');
                });
                // 看支持不支持FileReader  
                if (!file || !window.FileReader) return;

                if (/^image/.test(file.type)) {
                    // 创建一个reader  
                    let reader = new FileReader();
                    // 将图片2将转成 base64 格式  
                    reader.readAsDataURL(file);
                    // 读取成功后的回调  
                    reader.onloadend = function () {
                        let result = this.result;
                        let img = new Image();
                        img.src = result;
                        //判断图片是否大于1m,是就直接上传，反之压缩图片  
                        if (this.result.length <= (500 * 1024)) {
                            self.ajaxfile(this.result);
                        }else {
                            img.onload = function () {
                                let data = self.compress(img,Orientation);
                                self.ajaxfile(data);
                            }
                        }
                    }
                }
            },
            rotateImg (img, direction,canvas) {
                //最小与最大旋转方向，图片旋转4次后回到原方向      
                const min_step = 0;
                const max_step = 3;
                if (img == null)return;
                //img的高度和宽度不能在img元素隐藏后获取，否则会出错      
                let height = img.height;
                let width = img.width;
                let step = 2;
                if (step == null) {
                    step = min_step;
                }
                if (direction == 'right') {
                    step++;
                    //旋转到原位置，即超过最大值      
                    step > max_step && (step = min_step);
                } else {
                    step--;
                    step < min_step && (step = max_step);
                }
                //旋转角度以弧度值为参数      
                let degree = step * 90 * Math.PI / 180;
                let ctx = canvas.getContext('2d');
                switch (step) {
                    case 0:
                        canvas.width = width;
                        canvas.height = height;
                        ctx.drawImage(img, 0, 0);
                        break;
                    case 1:
                        canvas.width = height;
                        canvas.height = width;
                        ctx.rotate(degree);
                        ctx.drawImage(img, 0, -height);
                        break;
                    case 2:
                        canvas.width = width;
                        canvas.height = height;
                        ctx.rotate(degree);
                        ctx.drawImage(img, -width, -height);
                        break;
                    case 3:
                        canvas.width = height;
                        canvas.height = width;
                        ctx.rotate(degree);
                        ctx.drawImage(img, -width, 0);
                        break;
                }
            },
            compress(img,Orientation) {
                let canvas = document.createElement("canvas");
                let ctx = canvas.getContext('2d');
                //瓦片canvas  
                let tCanvas = document.createElement("canvas");
                let tctx = tCanvas.getContext("2d");
                let initSize = img.src.length;
                let width = img.width;
                let height = img.height;
                //如果图片大于四百万像素，计算压缩比并将大小压至400万以下  
                let ratio;
                if ((ratio = width * height / 4000000) > 1) {
                    console.log("大于400万像素")
                    ratio = Math.sqrt(ratio);
                    width /= ratio;
                    height /= ratio;
                } else {
                    ratio = 1;
                }
                canvas.width = width;
                canvas.height = height;
                //        铺底色  
                ctx.fillStyle = "#fff";
                ctx.fillRect(0, 0, canvas.width, canvas.height);
                //如果图片像素大于100万则使用瓦片绘制  
                let count;
                if ((count = width * height / 1000000) > 1) {
                    console.log("超过100W像素");
                    count = ~~(Math.sqrt(count) + 1); //计算要分成多少块瓦片  
                    //            计算每块瓦片的宽和高  
                    let nw = ~~(width / count);
                    let nh = ~~(height / count);
                    tCanvas.width = nw;
                    tCanvas.height = nh;
                    for (let i = 0; i < count; i++) {
                        for (let j = 0; j < count; j++) {
                            tctx.drawImage(img, i * nw * ratio, j * nh * ratio, nw * ratio, nh * ratio, 0, 0, nw, nh);
                            ctx.drawImage(tCanvas, i * nw, j * nh, nw, nh);
                        }
                    }
                } else {
                    ctx.drawImage(img, 0, 0, width, height);
                }
                //修复ios上传图片的时候 被旋转的问题  
                if(Orientation != "" && Orientation != 1){
                    switch(Orientation){
                        case 6://需要顺时针（向左）90度旋转  
                            this.rotateImg(img,'left',canvas);
                            break;
                        case 8://需要逆时针（向右）90度旋转  
                            this.rotateImg(img,'right',canvas);
                            break;
                        case 3://需要180度旋转  
                            this.rotateImg(img,'right',canvas);//转两次  
                            this.rotateImg(img,'right',canvas);
                            break;
                    }
                }
                //进行最小压缩  
                let ndata = canvas.toDataURL('image/jpeg', 0.1);
                console.log('压缩前：' + initSize);
                console.log('压缩后：' + ndata.length);
                console.log('压缩率：' + ~~(100 * (initSize - ndata.length) / initSize) + "%");
                tCanvas.width = tCanvas.height = canvas.width = canvas.height = 0;
                return ndata;
            },
            //////////////////////////图片上传//////////////////////////
            /////////////////////////////////////图片上传方法//////////////////////////////////////////
            createImage(file) {
                var _self = this;
                var reader = new FileReader();
                reader.readAsDataURL(file);
                reader.onload = function(e){
                    _self.ajaxfile(e.target.result);
                };
            },
            //将base64转换blob
            dataURLtoBlob(dataUrl) {
                var arr = dataUrl.split(','),
                    mime = arr[0].match(/:(.*?);/)[1],
                    bstr = atob(arr[1]),
                    n = bstr.length,
                    u8arr = new Uint8Array(n);
                while (n--) {
                    u8arr[n] = bstr.charCodeAt(n);
                }
                return new Blob([u8arr], { type: mime });
            },
            //上传图片
            ajaxfile(file){
                var _self = this;
                if(_self.imageList.length == 5){
                    layer.msg("最多上传5张图片");
                    return;
                }
                var myForm = new FormData();     //创建formdata
                var blobBin = _self.dataURLtoBlob(file);     //base64转换blob
                myForm.append("blobObject", blobBin);    //想formData添加blob数据
                var url = _self.utilHelper.apiUrl+'/api/uploadBase64';
                _self.$http.post(url,myForm).then((response)=>{
                    layer.closeAll('loading'); //关闭加载层
                    var data = response.body;
                    if(data.result == "1"){
                        var filesUrl = {
                            "url":data.resData.imgName,
                            "isQiNiu":false
                        };
                        _self.imageList.push(filesUrl);
                        var fileName = {
                            "file":file
                        };
                        _self.fileList.push(fileName);
                    }else{
                        layer.msg("图片上传失败，请重试");
                    }
                });
            },
            //图片预览
            previewImage(index){
                var _self = this;
                var imgList = new Array();
                for(var i = 0; i < _self.imageList.length; i++){
                    imgList.push(_self.imageList[i].url);
                }
                wx.previewImage({
                    current: imgList[index],
                    urls: imgList
                });
            },
            //删除图片
            deletefile(id){
                this.imageList.splice(id, 1);
                this.fileList.splice(id, 1);
            },
            /////////////////////////////////////图片上传方法//////////////////////////////////////////

		}
	}
	
</script>
<style scoped>
    .titlePhoto{font-weight: normal;padding: 10px;float: left}
    .photo-list{float:left}
    .photo-list li{float: left;width: 64px;height: 64px;position: relative;border:1px solid #cdcdcd;margin: 0 5px 10px;}
    .photo-list li>img{width: 100%;height: 100%;}
    .photo-list>li .fa-times-circle{position: absolute;right: -8px;top: -8px;color: #ff6666;font-size: 18px;}
    .photo-list .departureBtn{border:none;}
    .departureBtn>a{border: 1px dashed #7f7f7f;height: 100%;display: block;text-align: center;}
    .departureBtn>a .fa-plus{font-size: 30px;color: #7f7f7f;margin-top: 16px; }
    .departureBtn .fileBtn{position: absolute;left: 0;top: 0;width: 100%;height: 100%;z-index: 999;opacity: 0;}
    .operation-btn{padding: 0 12px}
    .sendmsg-div{
        padding: 0 12px;
        height: 40px;
        line-height: 40px;
    }
    .sendmsg-div input{
        -webkit-appearance: checkbox;
        width: 20px;
        height: 20px;
        vertical-align: top;
        margin-top: 10px;
    }
    .sendmsg-div font{
        font-weight: bold;
        font-size: 14px;
    }
</style>